#linuxcnc Logs

Apr 15 2023

01:30 AM Deejay: moin
04:56 AM JT-Cave: morning
05:18 AM travis_farmer[m]: Morning 👀
05:23 AM Tom_L: morning
07:14 AM Bing[m]: morning doctors
09:07 AM JT-Shop: so much for mowing... it's starting to rain
10:33 AM Tom_L: 45F.. we got the rain last night
10:42 AM Unterhaus_: 61F and raining. And it smells like a zoo in the house for some reason
10:44 AM roycroft: it's cloudy here, but not raining
10:45 AM roycroft: we had actual sunshine yesterday
10:45 AM roycroft: i may finally be able to cut the grass today
10:49 AM roguish[m]: sunny and chilly, low 50's
10:49 AM roguish[m]: F
10:54 AM * JT-Shop just found the receipt for the 48" box and pan brake he bought in 06
10:55 AM JT-Shop: I sold it for the same amount I paid for it including taxes -$0.27... not bad
11:33 AM Loetmichel_ is now known as Loetmichel
11:33 AM Loetmichel: hey, any Linux "knowers" here that can advise which distribution to use for an old Notebook i just dug out of the "forgotten" pile here in my workshop? Its a Lenovo B450, Pentium dualcore T4400 2.2ghz, 2gb ram, 64gb ssd, Nvidia G105m.
11:40 AM -!- #linuxcnc mode set to +v by ChanServ
12:18 PM JT-Shop_: we just got 1/2" of rain
12:18 PM -!- #linuxcnc mode set to +v by ChanServ
12:19 PM travis_farmer[m]: i am on 3" of sunshine, so far... :-D
12:28 PM Loetmichel: travis_farmer[m]: call to the weather service bureau: "i just wanted to notify you that the fire bigrade is pumping a few feet of you "Sunshine" out of my cellar right now"
12:28 PM Loetmichel: :)
12:29 PM Loetmichel: brigade
12:29 PM travis_farmer[m]: lol
12:38 PM roycroft: but have they asked for your shoe size yet, loetmichel?
12:40 PM Unterhaus_: I think the fire brigade would tell me to forget about it if I called them to pump out my basement
12:40 PM Unterhaus_: fortunately I had the source of flooding removed a while back. Unless the sewer explodes
12:46 PM roycroft: not many homes in my part of the world have basements
12:46 PM roycroft: with the water table being about 4cm below the surface, constructing a dry basement can be challenging
12:47 PM travis_farmer[m]: i have seen pictures of cases like that where the basement floated out of the hole before the house was built...
12:48 PM roguish[m]: travis_farmer: swimming pools do that too
12:48 PM travis_farmer[m]: yes, seen that as well
12:49 PM roguish[m]: it's a good giggle
12:58 PM c101horse[m]: fellas, question, ive started making the mounts for the new servo's but the mount needs to clamp on something behind a collar. what would be wise, bore hole to size and then use a slitting saw on it to make it two parts or do i make it two parts first and then bore the hole?
12:59 PM JT-Shop: the former would be easier to do, with a good fit only one slit is needed
01:16 PM boozeman4562[m]: Hi, I have one question about Mesa 7i96S and stepper drivers enable. Is there any danger to daisy chain all 4 of them to one input pin?
01:17 PM JT-Shop: normally everything is enabled when power is on
01:24 PM JT-Shop: # joint enable chain
01:24 PM JT-Shop: net joint-0-index-enable <=> pid.0.index-enable
01:24 PM JT-Shop: net joint-0-enable <= joint.0.amp-enable-out
01:24 PM JT-Shop: net joint-0-enable => pid.0.enable
01:24 PM JT-Shop: net joint-0-enable => hm2_[MESA](BOARD).0.stepgen.00.enable
01:24 PM JT-Shop: example from mesact configuration tool
01:42 PM Unterhaus_: cool, getting a phone call from shanghai
01:45 PM pcw-home: boozeman4562[m] do you mean driving all hardware enables from one output?
01:47 PM spray[m]: Notebooks are not recommended
01:51 PM c101horse[m]: i need it to be two separate parts since there's a collar in the way that isnt removeable
02:24 PM Loetmichel: Unterhaus_: Here in germany the fire fighters DO help with flood removal, as do the THW.
03:43 PM CaptHindsight[m]: c101horse🇳🇱: needs a visualization for proper comprehension of the issues
03:45 PM * c101horse[m] uploaded an image: (769KiB) < https://libera.ems.host/_matrix/media/v3/download/jauriarts.org/izKkTzhFhKwBZJgJEGFcAgTz/IMG_20230415_224314.jpg >
03:45 PM c101horse[m]: This
03:45 PM * c101horse[m] uploaded an image: (747KiB) < https://libera.ems.host/_matrix/media/v3/download/jauriarts.org/plgCZzYSFbyENkBBUivVbEbf/IMG_20230415_224320.jpg >
03:45 PM c101horse[m]: Needs a hole to clamp here
03:45 PM * c101horse[m] uploaded an image: (637KiB) < https://libera.ems.host/_matrix/media/v3/download/jauriarts.org/tiQZxRbBSVfztYfMbKxsbqGk/IMG_20230415_224332.jpg >
03:45 PM c101horse[m]: But this thing is in the way
04:27 PM Unterhaus_: I think people get around the bearing being in the way by using standoffs usually
04:56 PM c101horse[m]: Standoff would be no use here, i need to clamp around that. Ive decided on belt drive over direct drive
05:11 PM Loetmichel: c101horse[m]: i would probably have used a halved bevel gear to clamp around the shaft and then put the stepper 90° to the side with another bevel gear.
05:40 PM c101horse[m]: Anyway, bore then slit or slit then bore?
05:41 PM Tom_L: bore then slit if a tight fit, slit then bore if a loose fit
05:41 PM Tom_L: how's that for an answer?
05:41 PM c101horse[m]: Ta
05:41 PM JT-Shop: if you're making a mount for the stepper I'd make it from one piece with a cut out for the clamp half
05:41 PM c101horse[m]: That was what i was looking for
05:42 PM JT-Shop: bolt together with a spacer and bore
05:42 PM Tom_L: ^^ that way you can 'control' the size of the slit
05:42 PM c101horse[m]: I was thinking cut and bolt together without a spacer
05:43 PM Tom_L: otherwise you're at the mercy of the cutter
05:43 PM * Tom_L is stuffed with beef tips n mushrooms
05:43 PM c101horse[m]: Got plenty of splitting saws to choose from
05:44 PM Tom_L: even so, you may not want that big of a gap for some things
05:45 PM JT-Shop: do you have a drawing of what your building
05:45 PM Tom_L: an example of a slit then bore would be a connecting rod end cap
05:45 PM JT-Shop: yup
05:45 PM Tom_L: jt the last 3 pics
05:46 PM JT-Shop: saw them
05:46 PM c101horse[m]: No drawing
05:46 PM Tom_L: in my mind of what he's doing, the plate seems a bit thin
05:46 PM c101horse[m]: 15mm cold rolled
05:47 PM Tom_L: ok
05:47 PM c101horse[m]: Sounds thick enough to me
05:47 PM JT-Shop: can't see the thickness in first photo
05:47 PM Tom_L: yeah 15mm should do
05:48 PM c101horse[m]: Clamping would be 2 m8 8.8 bolts
05:48 PM Tom_L: from the end
05:49 PM Tom_L: so that shaft is stationary
05:49 PM c101horse[m]: The bit im pointing at yes
05:50 PM Tom_L: i would want some sort of pin or means to be sure the plate doesn't rotate
05:51 PM JT-Shop: building a wooden boat involves a lot of hammering
05:51 PM Tom_L: so you plan to remove the crank and replace it with a pulley to go to the stepper
05:52 PM Tom_L: and splinters i would imagine
05:52 PM c101horse[m]: The manufacturer of the mill offers a cnc version of it too, done pretty much the same way, just with more curves
05:52 PM Tom_L: the curves just make it cost more
05:52 PM c101horse[m]: Correct, taperlock hdt 5m pulleys
05:54 PM Tom_L: one solution might be to partially drill/ream the round shaft you're mounting to but not all the way thru then pin the cap for the plate so it can't rotoate
05:54 PM Tom_L: rotate
05:54 PM Tom_L: unless you feel friction fit is enough
05:54 PM c101horse[m]: Might do if it turns out to be a problem
05:55 PM c101horse[m]: The stepper brackets i bought from the internet were mounted the same way and those werent moving when clamped
05:55 PM Tom_L: what diameter is the shaft
05:56 PM Tom_L: 25-30mm?
05:56 PM Tom_L: maybe more
05:57 PM c101horse[m]: 30 if i remember correctly
05:58 PM Tom_L: so i would do what JT-Shop suggested and cut a piece off the plate for the 'end cap' then put a spacer say .020-.030" between as you bolt them together and cut /ream or bore the hole
05:59 PM Tom_L: probably bore because a 30mm reamer would be $$$
05:59 PM c101horse[m]: Thanks for the help again guys. Ill let yall know how things turned out when the first one is done
05:59 PM JT-Shop: yw
05:59 PM c101horse[m]: I could prolly do the reaming at work
05:59 PM Tom_L: how many are there?
05:59 PM JT-Shop: take photos
06:00 PM c101horse[m]: 3 brackets in total, all identical
06:00 PM Tom_L: reaming may not even be necessary because of the gap. drilling may be accurate enough
06:01 PM Tom_L: that's kinda up to you
06:01 PM c101horse[m]: We'll see, good night for now guys thanks a bunch
06:01 PM Tom_L: just be sure to paint it grey so it matches :)
06:04 PM Tom_L: also be aware how thick that tube is when you clamp it so it doesn't cause the shaft inside to bind
06:04 PM Tom_L: also that shouldn't really be a problem
06:10 PM Tom_L: on the other end of it, i hope the plate isn't too thick for the stepper shaft to mount the pulley to
06:10 PM Tom_L: if so, you may have to shave the back side of the plate down a bit to acomodate the stepper
07:39 PM -!- #linuxcnc mode set to +v by ChanServ
07:39 PM -!- #linuxcnc mode set to +v by ChanServ
07:44 PM -!- #linuxcnc mode set to +v by ChanServ
08:08 PM XXCoder: case hardening and stop. cool https://youtu.be/_TQ6-xar1Zk
08:16 PM Tom_L: alot of trouble just to case harden
08:16 PM Tom_L: even done it?
08:19 PM Tom_L: no sound so dunno what he's babbling about
08:54 PM XXCoder: theres captions
08:55 PM XXCoder: dunno too, the stop design is bit interesting, though rod holder is too think I think, so ypou'd have to set it fair distance off if rod is barely below cut line
08:55 PM XXCoder: *thick
09:04 PM Tom_L: for a small mill it's kinda bulky
09:15 PM XXCoder: shop I worked at had stops where rod is held by pretty thin clip
09:15 PM XXCoder: 1/8 inch? forgot exactly
09:15 PM XXCoder: less than half what he made
09:16 PM XXCoder: other side is thick of course
09:16 PM Tom_L: we used a dowel pin in the spindle with the speed set to 0 on alot of parts
09:16 PM XXCoder: so if its tight clearance you setup it so thin side is upwards
09:16 PM Tom_L: very repeatable and not in the way
09:16 PM XXCoder: yeah thats used pretty often too
09:31 PM roycroft: i have a tiny little stop that clamps on one of the vise jaws on my mill
09:33 PM roycroft: it's similar to this:
09:33 PM roycroft: https://www.ebay.com/itm/121115884003
09:33 PM Tom_L: yeah i have one of those
09:33 PM XXCoder: very effective as long as cut line is above that
09:33 PM roycroft: yes
09:34 PM roycroft: and it's really low profile, so it's usually pretty easy to keep the cut line above it
09:36 PM roycroft: and if it can't, it's easy to index the part to the stop, remove the stop perform the operation, index the stop to the part, replace the part
09:37 PM roycroft: where it doesn't work is when the part is wide
09:37 PM roycroft: close to or wider than the vise jaws
09:38 PM Tom_L: just don't make the mistake of cleaning up that index side then reattaching it
09:38 PM roycroft: that would be a problem
09:38 PM Tom_L: it's happened
09:39 PM Tom_L: that mistake usually happens in the cad though
09:40 PM Tom_L: i also have done that and then indexed the 2nd op of the finished edge
09:41 PM XXCoder: that reminded me of that fairly bad worker using wrong tool to clean up top
09:42 PM XXCoder: it left thin bar of uncut on one side
09:42 PM XXCoder: rather than figure out why, he went and manually cut that off
09:42 PM XXCoder: wrote down its all good
09:42 PM XXCoder: I ran 2 parts before I noticed, thankfully I could recover it
10:39 PM Tom_L: XXCoder, my kid uses toe clamps to hold the block to drill 150-200 hold down bolts to hold the part while machining
10:39 PM Tom_L: block weighing ~9k lbs
10:40 PM XXCoder: yeah thats good strat also
10:40 PM XXCoder: used similiar but with much smaller and thinner alum sheets
10:40 PM XXCoder: just clamp around it, drill holes, then bolt it down for cutting parts
10:40 PM Tom_L: he was pissed at the programmer the other day for getting the hole pattern off 18" and not telling him
10:41 PM Tom_L: http://tom-itx.no-ip.biz:81/~webpage/cnc/cincinnati/Material_block.jpg
10:41 PM Tom_L: that's what he was doing that day
10:42 PM XXCoder: i remember that picture and soda can bottom fix
10:42 PM Tom_L: you don't really wanna scrap one of those
10:44 PM XXCoder: yeah
10:44 PM XXCoder: i remember someone telling me that few months before i started worked, someone got fired because he scrapped 2 of $300,000 parts
10:45 PM XXCoder: its huge titanium "bone"
10:45 PM Tom_L: yeah, he's been running some titanium on one of the machines lately
10:45 PM XXCoder: (not huhe compared to your slab but yeah its big, 5 feet long and around foot thick, another dimension 10 inches
10:45 PM Tom_L: same basic machine with a slower spindle
10:45 PM XXCoder: its very expensive cast too
10:46 PM Tom_L: we did some test articles before the forgings were made from probably 18" square x 2.5' ti block
10:46 PM Tom_L: 6 off for testing
10:46 PM Tom_L: took over a week to do one
10:47 PM Tom_L: trailing link for landing gear
10:47 PM XXCoder: long. i dont remember how long it took for those bones to be made
10:47 PM XXCoder: i call it bone because it sure looks like some big dino bone
10:47 PM Tom_L: this was quite a while back as my bud is retired now
10:47 PM XXCoder: it had many steps oif milling
10:48 PM XXCoder: including high precision bores on ends and ears
10:48 PM Tom_L: https://www.clearwateren.com/structural-part-machining-anodizing.html
10:48 PM Tom_L: that pic in the middle of the 3 was the part
10:49 PM XXCoder: pretty complex allight
10:49 PM Tom_L: only pic left of it i can find
10:49 PM Tom_L: inside was drilled out too
10:49 PM Tom_L: like 3" insert drills or something like that
10:50 PM XXCoder: biggest drills I ever saw was 3". I have no idea why it even exists as could just mill ouit
10:51 PM Tom_L: on that, it was pretty deep
10:51 PM Tom_L: for a mill
10:51 PM XXCoder: hmm well thats possible reason then :)
10:51 PM Tom_L: i forget now but 2 or 3 were used to step size the hole
10:52 PM Tom_L: then iirc the ends were bored to size
11:04 PM Tom_L: XXCoder, that was in the 3 axis days :)